[PATCH v2] ath11k: skip sending vdev down for channel switch

[Wen Gong]

The ath11k driver currently sends vdev down to the firmware before
updating the channel context, which is followed by a vdev restart
command.

Sending vdev down is not required before sending a vdev restart,
because the firmware internally does vdev down when ath11k sends
a vdev restart command.

Firmware will happen crash while channel switch without this change.

Hence skip the vdev down command sending when updating the channel
context and then fix the firmware crash issue.

Tested-on: QCA6390 hw2.0 PCI WLAN.HST.1.0.1-01740-QCAHSTSWPLZ_V2_TO_X86-1

Signed-off-by: Wen Gong <quic_wgong at quicinc.com>
---
v2: rebased to latest ath.git master ath-202111170737

 drivers/net/wireless/ath/ath11k/mac.c | 32 +--------------------------
 1 file changed, 1 insertion(+), 31 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/mac.c b/drivers/net/wireless/ath/ath11k/mac.c
index 292b2b7eab11..fe03836c9a84 100644
--- a/drivers/net/wireless/ath/ath11k/mac.c
+++ b/drivers/net/wireless/ath/ath11k/mac.c
@@ -6363,37 +6363,7 @@ ath11k_mac_update_vif_chan(struct ath11k *ar,
 
 	lockdep_assert_held(&ar->conf_mutex);
 
-	for (i = 0; i < n_vifs; i++) {
-		arvif = (void *)vifs[i].vif->drv_priv;
-
-		if (vifs[i].vif->type == NL80211_IFTYPE_MONITOR)
-			monitor_vif = true;
-
-		ath11k_dbg(ab, ATH11K_DBG_MAC,
-			   "mac chanctx switch vdev_id %i freq %u->%u width %d->%d\n",
-			   arvif->vdev_id,
-			   vifs[i].old_ctx->def.chan->center_freq,
-			   vifs[i].new_ctx->def.chan->center_freq,
-			   vifs[i].old_ctx->def.width,
-			   vifs[i].new_ctx->def.width);
-
-		if (WARN_ON(!arvif->is_started))
-			continue;
-
-		if (WARN_ON(!arvif->is_up))
-			continue;
-
-		ret = ath11k_wmi_vdev_down(ar, arvif->vdev_id);
-		if (ret) {
-			ath11k_warn(ab, "failed to down vdev %d: %d\n",
-				    arvif->vdev_id, ret);
-			continue;
-		}
-
-		ar->num_started_vdevs--;
-	}
-
-	/* All relevant vdevs are downed and associated channel resources
+	/* Associated channel resources of all relevant vdevs
 	 * should be available for the channel switch now.
 	 */
 

base-commit: 63ec871bc50a306aac550e2d85f697ca2d5f5deb
-- 
2.31.1